Multi-Modal Trajectory and Coordinated Control of Microparticles Using Optoelectronic Tweezers

This paper focuses on precisely manipulating microparticle motion using an optoelectronic tweezer system. By developing a parameterized pattern-interaction framework, a series of experiments were conducted, demonstrating multimodal trajectory generation for a single particle, circular rotation, and parallel rotation of multiple particles within microgrooves (single or double particles per groove), as well as stepwise 'rotation-translation' control. Leveraging lightinduced dielectrophoresis and a non-uniform electric field gradient designed via an internal gear-shaped optical pattern, the system enables multi-parameter control of polystyrene microparticle behavior, including trajectory shape, rotational angular velocity, and coordinated motion among multiple particles. The results verify the system's capability in regulating complex multi-particle dynamics, expanding the application scope of OET-based micro/nano manipulation and providing technical support for biomedical particle handling and micro/nano-assembly.